Question

số nguyên y thỏa mãn \(\frac{y+5}{7-y}=\frac{2}{-5}\)

Answer 1

\(ĐK:y\ne0\)

    \(\frac{y+5}{7-y}=\frac{2}{-5}\)

\(\Leftrightarrow\left(y+5\right).\left(-5\right)=\left(7-y\right).2\)

\(\Leftrightarrow-5y-25=14-2y\)

\(\Leftrightarrow-3y=39\)

\(\Leftrightarrow y=-13\)

Vậy: \(y=-13\)

Tíck cho mìk vs nha Bao Bui !

Answer 2

\(\frac{y+5}{7-y}=\frac{2}{-5}\)=> -5(y + 5) = 2(7 - y) <=> -5y - 25 = 14 - 2y => -5y - 25 + (2y + 25) = 14 - 2y + (2y + 25) <=> -3y = 39 => y = -13